Cloudflare Wrangler is a
CLI tool designed for folks who are interested in using Cloudflare Workers. quote from Github Repository - https://github.com/cloudflare/wrangler
Cloudflare Workers is a service, where you can host javascript code, which will run when you open it's URL. There is no access to filesystem or direct connections to databases, but you can check examples in official docs to decide if you need that or not.